The footage taken from outside Trevor’s office at Bank of Ireland Asset Management on Leeson Street shows him talking to a man, who had been standing at the building for around a half an hour beforehand.

The footage revealed a man dressed in black, previously unknown to investigators, speaking to Trevor outside his workplace shortly before he vanished.

Trevor leaves the office around 4am, when someone follows him.

He was last seen at 4.14am crossing the Baggot Street Bridge and walking towards Haddington Road in the city centre.

MOST READ IN IRISH NEWS

DIY delivery

Dublin Fire Brigade deliver baby boy in a Woodies car park in northside of the city

Grim forecast

Met Eireann issue weather warning for five counties with thundery showers expected as well as risk of flooding